Optical transmitter for WDM systems
US6233082A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Oct 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0612
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical transmitter for generating any one of N carrier signals for use in an M-channel WDM system (M.gtoreq.N), each channel operating at a different carrier wavelength .lambda..sub.s (s=1, 2 . . . M), includes an optical source for generating the carrier signals at any one of multiplicity of N wavelengths .lambda..sub.i (i=1, 2 . . . N), where (1.ltoreq.N.ltoreq.M). A first controller selects a particular one of the wavelengths .lambda..sub.i at which the source operates. An optical modulator receives the carrier signal corresponding to the selected wavelength .lambda..sub.i and impresses information on the received signal. The modulator has a characteristic electronic bandgap and a wavelength .lambda..sub.g corresponding thereto. At a given temperature, .lambda..sub.g is offset from each .lambda..sub.i by an amount .DELTA..lambda..sub.i. For each wavelength .lambda..sub.i there is a predetermined value of .DELTA..lambda..sub.i which delivers preferred (e.g., optimum) transmission performance. In general, however, the actual .DELTA..lambda..sub.i may not be equal to the predetermined .DELTA..lambda..sub.i for all values of i. The difference between the actual .DELTA..lambda..s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.